EP2099063B1 - Film forming apparatus and method of forming film - Google Patents
Film forming apparatus and method of forming film Download PDFInfo
- Publication number
- EP2099063B1 EP2099063B1 EP07832789.7A EP07832789A EP2099063B1 EP 2099063 B1 EP2099063 B1 EP 2099063B1 EP 07832789 A EP07832789 A EP 07832789A EP 2099063 B1 EP2099063 B1 EP 2099063B1
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- Prior art keywords
- film deposition
- process chamber
- thermal insulation
- gas
- insulation member
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- 238000000034 method Methods 0.000 title claims description 133
- 239000000758 substrate Substances 0.000 claims description 138
- 238000000151 deposition Methods 0.000 claims description 135
- 239000007789 gas Substances 0.000 claims description 123
- 230000008021 deposition Effects 0.000 claims description 118
- 238000009413 insulation Methods 0.000 claims description 66
- 239000000463 material Substances 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000010453 quartz Substances 0.000 claims description 10
- 239000000470 constituent Substances 0.000 claims description 8
- 239000000112 cooling gas Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 25
- 229910010271 silicon carbide Inorganic materials 0.000 description 25
- 239000004065 semiconductor Substances 0.000 description 21
- 239000013078 crystal Substances 0.000 description 12
- 239000012535 impurity Substances 0.000 description 9
- 230000006698 induction Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 8
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 7
- 239000003575 carbonaceous material Substances 0.000 description 7
- 239000000356 contaminant Substances 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- -1 for example Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
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- 239000013014 purified material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/48—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation
- C23C16/481—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating by irradiation, e.g. photolysis, radiolysis, particle radiation by radiant heating of the substrate
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/46—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for heating the substrate
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/10—Heating of the reaction chamber or the substrate
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
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- H01L21/67155—Apparatus for manufacturing or treating in a plurality of work-stations
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- H01L21/677—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
- H01L21/67739—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber
- H01L21/67748—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber horizontal transfer of a single workpiece
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- H01L21/687—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L21/02365—Forming inorganic semiconducting materials on a substrate
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Definitions
- the present invention relates to a film deposition apparatus and a deposition method where film deposition on a substrate is performed using induction heating.
- An epitaxial growth method can grow a single crystal on a substrate so that the single crystal has the same crystal orientation as the crystal orientation of a substrate crystal, and is employed in various situations.
- Patent Document 1 and Patent Document 2 disclose a silicon wafer fabricating method in which Si is grown by the epitaxial deposition method.
- the substrate on which a predetermined film is to be grown is preferably uniformly heated at a temperature higher than the decomposition temperature of a source gas in order to thermally decompose the source gas.
- Patent Document 1 Japanese Patent Application Laid-Open Publication No. H9-232275 .
- Patent Document 2 Japanese Patent Application Laid-Open Publication No. 2004-323900 .
- Document JP H11-157988 A discloses a film deposition apparatus and method according to the preambles of claim 1 and 9.
- a problem may be caused in terms of a configuration of the film deposition apparatus.
- a commonly-used film deposition apparatus is configured so that the substrate to be used for film deposition may be held in a process chamber whose inner space is maintained at reduced pressures.
- process chamber walls are accordingly heated and the process chamber may be damaged.
- contaminant substances that may serve as a contamination source for the film deposited on the substrate may be discharged from the process chamber by the heat, depending on the material of the process chamber.
- the process chamber is preferably configured with materials having low dielectric loss (permittivity) in order not to be heated.
- a general objective of the present invention is to provide a novel and useful film deposition apparatus and film deposition method that are capable of solving the above problem.
- a specific objective is to provide a film deposition apparatus and film deposition method that are capable of stably decomposing a film deposition gas having a high decomposition temperature by employing induction heating in order to perform film deposition.
- a film deposition apparatus according to claim 1.
- the thermal insulation member is made of a porous material including carbon as a primary constituent, thereby differentiating a thermal conductivity of the thermal insulation member from a thermal conductivity of the substrate holding portion.
- a film deposition apparatus according to the second aspect, wherein a carbon-based coating film is formed on a surface of the thermal insulation member.
- a film deposition apparatus according to any one of the first through the third aspects, wherein the process chamber is made of quartz.
- the substrate holding portion includes a susceptor that is to be heated and may hold plural of the substrates, and a structure-to-be-heated that is to be heated and may be formed around the susceptor, wherein the structure-to-be-heated includes two openings opposing each other, and wherein the film deposition gas is supplied from one of the two openings and evacuated from the other opening.
- a film deposition apparatus wherein the susceptor may hold a transfer plate on which the plural substrates are placed, and wherein the susceptor is configured to rotate the transfer plate around a predetermined rotation axis.
- a film deposition apparatus according to the sixth aspect, wherein the process chamber is connected to a transfer chamber having inside thereof a transfer portion, and wherein the transfer plate is transferred onto or out from the susceptor by the transfer portion.
- a film deposition apparatus according to any one of the first through the seventh aspects, wherein a film corresponding to the film deposition gas is formed on the substrate.
- the film deposition gas includes a gas having Si and C as primary constituents.
- the film deposition gas includes a gas denoted by CxHy (x, y: integer).
- a film deposition method according to any one of the ninth through eleventh aspects, wherein the substrate holding portion is inductively heated so that the substrates are heated at 1200 °C or more in the step of heating the substrate holding portion.
- a film deposition apparatus and film deposition method that are capable of stably decomposing a film deposition gas having a high decomposition temperature by employing induction heating in order to perform film deposition are provided.
- Fig. 1 is a view illustrating an example of a configuration of a semiconductor device (metal oxide semiconductor (MOS) transistor) fabricated through an epitaxial growth method.
- MOS metal oxide semiconductor
- a semiconductor device 10 has a substrate 1 composed of an n-type silicon carbide semiconductor (SiC, hereinafter), and an n-type SiC layer (n-type epitaxial layer) 2 formed on the substrate 1 (a surface of the substrate 1).
- the SiC layer 2 is formed on the substrate crystal by an epitaxial growth method so that the SiC layer 2 has the same crystal orientation as the crystal orientation of the substrate crystal and is single crystalline.
- the SiC layer 2 does not necessarily need to have the same crystal orientation as the crystal orientation of the substrate crystal, and may be polycrystalline.
- P-type impurity diffusion regions 3A and 3B are formed leaving a predetermined clearance, and n-type impurity regions 4A and 4B are formed within the p-type impurity diffusion regions 3A and 3B, respectively.
- a gate insulation film 6 is formed on the SiC layer 2 so that the gate insulation film 6 extends from a part of the n-type impurity diffusion region 4A to a part of the n-type impurity diffusion region 4B.
- An electrode 7 is formed on the gate insulation film 6.
- an electrode 5A is formed on the p-type impurity diffusion region 3A and the n-type impurity diffusion region 4A, and an electrode 5B is similarly formed on the p-type impurity diffusion region 3B and the n-type impurity diffusion region 4B.
- an electrode 8 is formed on a surface (back surface) of the substrate 1, the surface being opposite to the SiC layer 2.
- the electrode 7 serves as a gate electrode
- the electrodes 5A and 5B serve as source electrodes
- the electrode 8 serves as a drain electrode.
- the above semiconductor device 10 is advantageous in that a so-called ON resistance (resistivity of a drift layer) can be greatly suppressed compared with a conventional semiconductor device using, for example, Si. With this, an effect is demonstrated that electricity usage efficiency is improved.
- Fig. 2 is a table comparing characteristics of Si, GaAs, and SiC, which are used as semiconductor materials.
- SiC has an advantage of a greater electric field strength Ec at which insulation breakdown occurs by an order of magnitude one or more than Si, which has conventionally been used for fabricating a semiconductor device. Because the above-mentioned ON resistance is inversely proportional to the cube of the electric field strength at insulation breakdown, the ON resistance is reduced and thus the electricity usage efficiency can be improved in the semiconductor device using SiC having a greater electric field strength Ec at insulation breakdown.
- SiC has a wide bandgap compared with Si and GaAs
- a semiconductor device using SiC can operate in high temperatures.
- the semiconductor device fabricated with SiC can operate in high temperatures more than or equal to 400 °C, while the maximum operational temperature of the semiconductor device fabricated with Si is about 150 °C.
- any cooling devices that have conventionally been necessary for the semiconductor device becomes unnecessary.
- such a semiconductor device can be used in severe conditions, compared with the conventional device.
- SiC can be formed, for example, by an epitaxial growth method.
- an example of combination of gases employed for film deposition of SiC is SiH 4 and H 2 .
- hydrocarbon gases such as C 3 H 8 that is difficult to be decomposed may be employed.
- C 3 H 8 was used, for example, the substrate needs to be heated at a temperature more than or equal to 1200 °C, and when the substrate is heated at such high temperatures, a following problem may be caused.
- a general film deposition apparatus is configured so that the substrate to be used for film deposition is held in the process chamber.
- the inside of the process chamber is maintained at reduced pressures, and a predetermined film is formed on the substrate.
- the process chamber is preferably configured with materials, for example, quartz (quartz glass) having low dielectric loss (dielectric constant) in order not to be heated.
- a thermal insulation member which thermally insulates the substrate holding portion from the process chamber is provided in the process chamber in the film deposition apparatus according to an embodiment of the present invention. Therefore, even if the substrate (the substrate holding portion) is heated at high temperatures, the wall surface of the process chamber can be maintained at low temperatures. Therefore, it becomes possible to avoid damage in the process chamber and to reduce emission of contaminant substances from the process chamber, thereby enabling stable heating of the substrate.
- the process chamber is maintained at low temperatures, the degree of freedom is improved in selecting materials that constitute the process chamber. For this reason, it becomes possible to configure the process chamber by using a material such as quartz having small dielectric loss (permittivity), and reduced emission of contaminant substances, and thus the epitaxial growth is carried out by stably decomposing the source gases.
- the thermal insulation member is arranged in the process chamber where the film deposition gases are decomposed, it is preferable to employ a stable and clean (highly purified) material that is less likely to discharge the contaminant substances when being heated and be decomposed or altered.
- the above thermal insulation member is preferably made of carbon.
- the insulation performance can be enhanced by, for example, making carbon porous (increasing porosity).
- Fig. 3 is a schematic view illustrating a film deposition apparatus 100 according to an example 1 of the present disclosure.
- the film deposition apparatus 100 has a process chamber 101 having a shape of substantially a rectangular solid (a substantial tubular shape), inside which a reduced pressure space 101A is defined.
- the reduced pressure space 101A there is a substrate holding portion that holds a substrate (not shown in Fig. 3 , but shown in detail in Fig. 4 ), where a semiconductor film is grown on the substrate held on the substrate holding portion.
- An inner structure of the reduced pressure space 101A is omitted in Fig. 3 , but shown in detail in Fig. 4 and the subsequent drawings.
- the process chamber 101 is connected with an evacuation line 112 provided with a pressure adjuster 113 composed of, for example, a conductance variable valve, and an evacuation apparatus 114 such as a vacuum pump, and thus the pressure of the reduced pressure space 101A can be adjusted at a pressure (reduced pressure) lower than atmospheric pressure.
- the process chamber 101 is provided with a pressure gauge 111, and thus the pressure of the reduced pressure space 101A is adjusted by the pressure adjuster 113 in accordance with a pressure value measured by the pressure gauge 111.
- a coil 107 connected to a high frequency wave power supplier 107A is arranged outside the process chamber 101. High frequency wave power is applied to the coil 107 from the high frequency wave power supplier 107A, and thus the substrate holding portion (not shown) in the reduced pressure space 101A is inductively heated.
- film deposition gases as raw materials for film deposition are supplied into the process chamber 101 (the reduced pressure space 101A) by a gas supplying portion 100G.
- the gas supplying portion 100G has a gas line 130, and a gas line 130A, a gas line 130B, a gas line 130C, a gas line 130D, and a gas line 130E that are connected to the gas line 130.
- the gas line 130A having a mass flow controller (MFC) 131A and a valve 132A is connected to a gas supplying source 133A that supplies SiH 4 gas, so that the SiH 4 gas is supplied to the process chamber 101.
- MFC mass flow controller
- gas lines 130B through 130E provided with mass flow controllers (MFCs) 131B through 131E and valves 132B through 132E, respectively, are connected to corresponding gas supplying sources 133B through 133E.
- MFCs mass flow controllers
- H 2 gas, trimethyl aluminum (TMA) gas, and N 2 gas are supplied from the gas supplying sources 133B through 133E, respectively.
- SiC film having Si and C as primary constituents
- SiH 4 gas, C 3 H 8 gas which are the film deposition gases as the raw materials for the film deposition, and H 2 gas are supplied to the process chamber 101, while the substrate is maintained at an appropriate temperature.
- TMA gas and N 2 gas may be supplied to the process chamber 101 in addition to SiH 4 gas, C 3 H 8 gas and H 2 gas, when necessary, so that electrical properties of the SiC film formed on the substrate may be adjusted.
- gases are merely exemplified as gases to be used for film deposition.
- the present invention is not limited to the above gases, but other gases may be used to form the SiC film.
- the present invention is not limited to the SiC film, but other films may be formed by using other gases.
- cooling gas for cooling the process chamber 101 is supplied to the process chamber 101 (the reduced pressure space 101A) through a gas line 134.
- the gas line 134 provided with an MFC 135 and a valve 136 is connected to a gas supplying source 137 that supplies the cooling gas (e.g., an inert gas such as argon (Ar)), so that the cooling gas can be supplied into the process chamber 101.
- the cooling gas e.g., an inert gas such as argon (Ar)
- Film deposition procedures e.g., operations such as an opening/closing of the valves, a flow rate control, application of high frequency waves, and the like
- a program that may be called a recipe in the film deposition apparatus 101.
- the operations of the valves, the MFCs and the like are controlled by a control apparatus 120 having a CPU 121. Connection wirings for these components are omitted in the drawings.
- the control apparatus 120 has the CPU 121, a memory medium 122 that stores the above program, an input portion 123 such as a keyboard, a display portion 126, a communications portion 125 for connecting to a network and the like, and a memory 124.
- Fig. 4 is a schematic cross-sectional view illustrating an inner configuration of the process chamber 101 explained in reference to Fig. 3 .
- the same reference symbols are given to the portions that have been previously explained.
- a substrate holding portion 102 that holds a substrate W in the reduced pressure space 101A is provided inside the process chamber 101.
- the substrate holding portion 102 is inductively heated by the coil 107 provided outside the process chamber 101.
- the substrate W is inductively heated by the coil 107, and also heated through radiation and heat conduction from the substrate holding portion 102.
- the substrate W is heated at about a temperature that can decompose the film deposition gases so that a surface reaction (epitaxial growth) takes place.
- the substrate W is heated at at least 1200 °C or more (e.g., 1550 °C through 1650 °C). In this case, the substrate holding portion 102 is also heated at substantially the same temperature.
- a thermal insulation member 105 is provided between the substrate holding portion 102 (substrate W) and the process chamber 101, and thermally insulates the process chamber 101 from the substrate holding portion 102 (substrate W) that is inductively heated to high temperatures.
- the process chamber 101 is made of, for example, quartz. Because quartz has a low dielectric loss and is not inductively heated, quartz is preferable as the material for the process chamber 101. In addition, because quartz may have high purity, and discharge a lesser amount of the emission gas that may contaminate the film even when being heated in a reduced pressure environment, quartz is preferable as the material that defines the reduced pressure space when the film that becomes a part of a high performance device is formed.
- the thermal insulation member 105 and the substrate holding portion 102 that are heated at high temperatures in the reduced pressure space 101A are preferably made of a stable, purified material (having a high purity) that is less likely to discharge contaminant substances when being heated.
- the substrate holding portion 102 and the thermal insulation member 105 are both preferably formed of carbon (graphite).
- the substrate holding portion 102 is preferably made of a high density carbon material, so that the substrate holding portion 102 is easily heated by inductive heating and can heat the substrate through radiation.
- a carbon material preferably has as high density as is referred to as a bulk material.
- the thermal insulation member 105 is preferably formed of a low density carbon material in order to enhance thermal insulation performance.
- a carbon material preferably has an extremely greater porosity than the above bulk material.
- such a carbon material preferable for thermal insulation has voids that can be, for example, visually observed.
- Such a carbon material may be recited here as a porously formed material, regardless of a shape of the voids in this specification.
- the thermal insulation member 105 may be made of a carbon material that includes a substance for controlling the thermal conductivity of carbon at a level where the film formed on the substrate is not contaminated, when necessary.
- the substrate holding portion 102 and the thermal insulation member 105 are both made of the same material (carbon) as the primary constituents, which can preferably be heated in a reduced pressure environment, these carbons are different in terms of thermal conductivities, which is caused mainly by a difference of the densities (micro structure of the materials).
- a predetermined coating film may be coated on the surfaces of the substrate holding portion 102 and the thermal insulation member 105.
- the surface of the substrate holding portion 102 is coated with a SiC film
- the surface of the thermal insulation member 105 is coated with a carbon film having a higher density than the density of the thermal insulation member 105.
- a thermal insulation member holding structure 106 made of quartz, is formed outside the thermal insulation member 105 in order to cover the thermal insulation member 105.
- the thermal insulation member holding structure 106 is configured to hold the thermal insulation member 105 separated from the process chamber 101. For this reason, a thermal insulation space 101b is defined between the process chamber 101 and the thermal insulation member 105, thereby effectively suppressing a rise in temperature of the process chamber 101.
- the thermal insulation member holding structure 106 is supported by a pillar-shaped supporting portion 106A placed on a bottom surface of the process chamber 101.
- the cooling gas e.g., Ar gas
- the thermal insulation space 101b is supplied to the thermal insulation space 101b from the gas line 134 ( Fig. 3 ).
- Such gas cooling also suppresses a rise in temperature of the process chamber 101.
- the film deposition gases are supplied from the gas line 130 ( Fig. 3 ) to a film deposition gas supplying space 101a that is defined inside the thermal insulation member holding structure 106 and where the substrate holding portion 102 and the thermal insulation member 105 are located.
- the film deposition gases are prevented from diffusing in the reduced pressure space 101A by the thermal insulation member holding structure 106, thereby efficiently supplying the film deposition gases to the substrate W.
- Such a configuration contributes to an improved usage efficiency of the film deposition gases.
- the thermal insulation member holding structure 106 separates the reduced pressure space 101A into substantially two spaces (the film deposition gas supplying space 101a, and the thermal insulation space 101b). Therefore, the temperature increase of the process chamber 101 can be effectively reduced, and the usage efficiency of the film deposition gases is improved. Moreover, because the above cooling medium is supplied to the thermal insulation space 101b defined between the substrate holding portion 102 and the process chamber 101, the rise in temperature of the process chamber 101 can be effectively reduced, in addition to the substrate holding portion 102, which is heated to high temperatures, being separated from the process chamber 101 by the thermal insulation member 105.
- the substrate holding portion 102 has a susceptor 103 on which the substrate W is placed and a structure-to-be-heated 104 arranged around the susceptor 103.
- the susceptor 103 is substantially disk-shaped and has a concave portion in the upper surface.
- a substantially disk-shaped transfer plate 110 on which plural substrates W are placed is placed in the concave portion.
- the plural substrates W are placed on the transfer plate 110, and the transfer plate 110 on which the plural substrates W are placed is transferred and placed in the concave portion of the susceptor 103 by a transfer portion such as a transfer arm (described later) .
- the susceptor 103 is configured so that a shaft portion 108 is inserted into a center hole formed in the center portion of the susceptor 103.
- the shaft portion 108 is movable upward or downward and rotatable by a driving portion 109 provided at the bottom end of the shaft portion 108.
- a substantially disk-shaped distal end portion is formed to be stepwise as a whole at the upper end of the shaft portion 108.
- the distal end portion may be fitted with the center hole formed at the center portion of the transfer plate 110 in order to raise the transfer plate 110.
- the transfer plate 110 is raised by the shaft portion 108.
- the transfer plate 110 is rotated around the shaft portion 108 as a center axis. Therefore, across-the-wafer variations and wafer-to-wafer variations in terms of film deposition rate, film thickness, and film properties are reduced.
- Fig. 5 is a plan view illustrating the transfer plate 110 placed on the susceptor 103, and the plural substrates W placed on the transfer plate 110.
- the distal end portion of the shaft portion 108 is fitted with the center hole of the transfer plate 110.
- this drawing illustrates eight substrates W placed at the equal angular intervals as one example, the number of the substrates and positions where the substrates are placed are not limited to the example shown in the drawing.
- the transfer plate 110 is preferably formed of the same material (carbon) as the susceptor 103 because the transfer plate 110 is inductively heated in the reduced pressure space 110A.
- Fig. 6 is a perspective view illustrating the structure-to-be-heated 104 that along with the susceptor 103 constitutes the substrate holding portion 102.
- the structure-to-be-heated 104 is substantially tubular-shaped (rectangular-solid-shaped), for example.
- the structure-to-be-heated 104 is arranged around the susceptor 103 in order to surround the susceptor 103.
- the structure-to-be-heated 104 has two openings corresponding to two opposing surfaces of the rectangular solid shape, and is arranged so that the film deposition gases are supplied from one of the two openings and evacuated from the other opening.
- the film deposition gases supplied to the film deposition gas supplying space 101a flow substantially in a direction parallel to the substrates W and are evacuated from the process chamber 101.
- the substrates W can be highly effectively heated with an improved uniformity.
- the substrates W are inductively heated, and also heated through radiation from the susceptor 103 (the transfer plate 110).
- the structure-to-be-heated 104 having a larger mass than the susceptor 103 and the transfer plate 110 is provided, the substrates W are more effectively heated.
- the substrates W are heated from the surroundings of the substrates W (from plural directions) through radiation from the structure-to-be-heated 104. Therefore, the substrates W are more uniformly heated.
- the induction heating by the coil 107 is capable of efficiently heating the substrates W with excellent uniformity.
- the coil 107 is preferably arranged so that the coil 107 is wound around the process chamber 101. With this, the substrates W can be heated with better uniformity.
- the coil 107 is used in combination with the structure-to-be-heated 104, the substrates W can be more efficiently heated with far better uniformity.
- the transfer plate 110 on which the plural substrates W are placed is transferred by the transfer portion (e.g., the transfer arm), which is described later in reference to, for example, Fig. 8 and the subsequent drawings.
- the transfer portion e.g., the transfer arm
- the plural substrates W are placed on the disk-shaped transfer plate 110 at step S1.
- the transfer plate 110 on which the plural substrates W are placed is transferred onto the susceptor (susceptor-to-be-heated) 103 by the transfer portion (later described) at step S2.
- the susceptor-to-be-heated 103 and the transfer plate 110 held by the susceptor-to-be-heated 103 are rotated at a predetermined rate at step S3.
- the film deposition gases are supplied to the film deposition gas supplying space 101a at step S4.
- high frequency wave power is applied to the coil 107 from the high frequency wave power supplier 107A, and the substrate holding portion 102, the transfer plate 110, and the substrates W are inductively heated at step S5.
- the transfer plate 110 on which the substrates W are placed is transferred out from the process chamber 101 by the transfer portion at step S6.
- the film (SiC film) having Si and C as primary constituents can be epitaxially grown on the substrates W.
- SiH 4 gas, C 3 H 8 gas, and H 2 gas as the film deposition gases are supplied to the process chamber 101 (film deposition gas supplying space 101a).
- TMA gas and N 2 gas may be also supplied, when necessary.
- a flow rate of SiH 4 gas is 10 sccm through 30 sccm; a flow rate of C 3 H 8 gas is 10 sccm through 20 sccm; and a flow rate of H 2 gas is 50 slm through 200 slm.
- the flow rates are not limited to these values.
- the substrate holding portion 102 (substrates W) is inductively heated by the coil 107 arranged outside the process chamber 101 at step S5
- the substrates Ware heated at temperatures of about 1550 °C through about 1650 °C.
- steps S3 through S5 may be permuted, or may be carried out substantially at the same time. Furthermore, by arbitrarily changing a period of time required for each step, the SiC film having a desired thickness can be formed.
- the transfer chamber is generally used that transfers the substrate (a transfer plate on which the substrate is placed). Therefore, the film deposition apparatus is configured to have the transfer chamber as explained in the following.
- Fig. 8 is a schematic perspective view illustrating an example of configuring the film deposition apparatus by connecting a transfer chamber 201 having a transfer arm (transfer portion) 201A to the process chamber 101.
- the same reference symbols are given to the portions that have already been explained, and detailed explanations are omitted.
- Fig. 8 the inner configuration of the process chamber 101, the evacuation line connected to the process chamber 101 and the like are omitted.
- the process chamber 101 that has been explained in reference to Figs. 4 and 5 is connected to the transfer chamber 201 via a process chamber 101B.
- a gas nozzle (film deposition gas supplying portion) 101C for supplying the film deposition gases is provided under the process chamber 101B.
- the film deposition gases are supplied to the film deposition gas supplying space 101a ( Fig. 4 ) from the gas nozzle 101C.
- the transfer plate 110 ( Fig. 5 ) on which the substrates W are placed is transferred into the process chamber 101 from the transfer chamber 201 by the transfer arm 201A.
- the transfer plate 110 is slotted into the film deposition gas supplying space 101a ( Fig. 4 ) by the transfer arm 201A, and placed on the susceptor 103 (omitted in this drawing) .
- the transfer plate 110 is transferred out from the process chamber 101 to the transfer chamber 201 similarly by the transfer arm 201A.
- Fig. 9 is a schematic plan view illustrating an example of configuring a substrate process apparatus 1000 by connecting plural process chambers 101 (process apparatuses 100) to the transfer chamber 201.
- process apparatuses 100 process apparatuses 100
- the same reference symbols are given to the portions that have already been explained, and the explanations are omitted.
- the substrate process apparatus 1000 has ports 205A through 205C in which holders (not shown) are placed, the holders having the transfer plates 110 placed on the holders, and a loader 203 which corresponds to a transfer area of the holders.
- the loader 203 is connected to load locks 202A, 202B to which the transfer plates 110 are transferred.
- the load locks 202A, 202B are connected to the transfer chamber 201 that has already been explained in reference to Fig. 8 .
- the two process chambers 101 shown previously are connected to the transfer chamber 201.
- Other configurations of the process chambers 101 (the coil, the high frequency wave power supplier, the evacuation line, the gas line, and the like) except for the process chambers 101 are omitted in the drawing.
- the transfer plate 110 (substrates W) placed in any one of the ports 205A through 205C is transferred into the load lock 202A or the load lock 2028 via the loader 203.
- the transfer plate 110 is further transferred into the film deposition apparatus 100 (process chamber 101) from any one of the load locks 202A, 202B through the transfer chamber 201.
- the transfer plate 110 may be aligned using an alignment mechanism 204 that is provided in the loader 203.
- the transfer plate 110 (substrates W) is transferred back to either one of the load locks 202A, 202B via the transfer chamber 201, and further back to any one of the ports 205A through 205C via the loader 203.
- the film deposition onto the substrates can be successively and efficiently carried out by connecting configurations, such as the transfer chamber 201, for transferring the transfer plate 110 (substrate W) to the film deposition apparatus 100 (process chamber 101).
- the substrate process apparatus 1000 is not limited to the above configuration, but may be altered or modified in various ways.
- the number of the film deposition apparatuses 100 (process chambers 101) connected to the transfer chamber 201 is not limited to two.
- three or four film deposition apparatuses 100 may be connected.
- other apparatuses where other substrate processes are carried out, rather than the film deposition apparatus 100 may be connected to the transfer chamber 201. In such a manner, the configuration of the substrate process apparatus 1000 may be modified, when necessary, thereby making it possible to improve substrate process (film deposition) efficiency.
- a film deposition apparatus and a film deposition method that are capable of stably decomposing film deposition gases having high decomposition temperatures by using induction heating in order to perform film deposition.
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JP2006348502A JP5051875B2 (ja) | 2006-12-25 | 2006-12-25 | 成膜装置および成膜方法 |
PCT/JP2007/073074 WO2008078503A1 (ja) | 2006-12-25 | 2007-11-29 | 成膜装置および成膜方法 |
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US (1) | US8696814B2 (ja) |
EP (1) | EP2099063B1 (ja) |
JP (1) | JP5051875B2 (ja) |
KR (2) | KR101211897B1 (ja) |
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- 2007-11-29 EP EP07832789.7A patent/EP2099063B1/en active Active
- 2007-11-29 CN CN2007800478454A patent/CN101568993B/zh active Active
- 2007-11-29 KR KR1020097012799A patent/KR101211897B1/ko active IP Right Grant
- 2007-11-29 KR KR1020127001102A patent/KR20120023854A/ko not_active Application Discontinuation
- 2007-11-29 US US12/519,933 patent/US8696814B2/en active Active
- 2007-12-21 TW TW096149431A patent/TWI424475B/zh active
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EP2099063A4 (en) | 2013-07-03 |
KR20090089876A (ko) | 2009-08-24 |
JP2008159947A (ja) | 2008-07-10 |
WO2008078503A1 (ja) | 2008-07-03 |
US8696814B2 (en) | 2014-04-15 |
EP2099063A1 (en) | 2009-09-09 |
JP5051875B2 (ja) | 2012-10-17 |
TWI424475B (zh) | 2014-01-21 |
TW200842948A (en) | 2008-11-01 |
KR101211897B1 (ko) | 2012-12-13 |
KR20120023854A (ko) | 2012-03-13 |
CN101568993B (zh) | 2010-12-22 |
US20100092666A1 (en) | 2010-04-15 |
CN101568993A (zh) | 2009-10-28 |
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